Gun Review: A TFB Exclusive, The New CMMG MK47 K Mutant Pistol

A while back Alex C. and I reviewed the CMMG Mutant rifle for TFB. We were rather impressed with what CMMG was able to achieve that the second that we heard about the CMMG Mutant pistol I jumped at the chance to review it. After getting word back to my editor I would love to review it CMMG shipped the new CMMG MK47 K Mutant pistol out quickly. CMMG will have a press release out Monday officially announcing to the rest of the world this new Mutant pistol.

When my FFL called me to tell me “this weird ar-15 pistol showed up” I had to get right over there and get it out to the range. If you take a look at Alex C.’s article about the Mutant rifle here he covers a lot of the technical details rather well. Looking at the Mutant pistol you can see that, like an AR pistol, the Mutant pistol is just a shortened Mutant rifle. I am sure there is some engineering wizardry going on inside to make the pistol as reliable as the full size rifle, but I don’t plan to get too far into those.

Let’s take a look at the specs that CMMG provided me.

Screen Shot 2015-07-28 at 2.22.38 PM

The Mutant pistol showed up with two of the Magpul AK mags and a shortaned version of the keymod rail they use on the rifle wrapped around the 10″ 7.62x39mm barrel. I threw my Eotech onto the pistol because the Mutant pistol shipped to me with no sights. The trigger is a pretty standard mil-spec style unit, I honestly don’t think I would like a lighter one as long as the Mutant is in pistol form.


On the end of the 10″ barrel they attached the same “SV” brake that is used on the rifle, when we tested the Mutant rifle we found the brake to be very effective. Without shouldering the pistol I can’t really comment on how effective it is, but it sure does look cool. I am sure that if you paid the ATF their money and made it into an SBR it would be just as effective as it is on the rifle. You can also see a closeup of the RKM9 Keymod rail that the pistol shares with it’s big brother.


One of the few changes to the pistol is a nicely knurled pistol buffer tube. CMMG was also kind enough to include a hook type attachment plate for a single point sling.


The layout of the pistol is identical to the rifle. I really liked the oversized AK type mag release. While it is a small detail I thought it was rather well thought out.


To the firing line with the new CMMG Mutant pistol! I started out with a standard pistol firing grip. You can see that the muzzle flip is pretty significant, but not out of control.


I decided shooting it like most people shoot AR pistols was in order. Disregard red dot, point shoot only! I have to admit, it was kinda fun.


I handed the pistol off to Alex C. to see how he felt the pistol version stacked up to the rifle we previously tested. You can see that Alex decided to hold the pistol with the buffer tube against his cheek, the recoil is just a bit too stiff to fire the gun in this manner. Alex quickly changed his shooting style.


Alex decided that shooting it like he would a regular pistol was a more attractive option. Recoil still is a bit stiff, but at least you aren’t getting hit in the nose with the charging handle.


After I pried the gun out of Alex’s hands I loaded the mag back up and tried my hand at shooting the pistol with the buffer tube against my cheek. I can’t say I recommend it.


I have to admit, if the Mutant pistol had been a short barrel rifle I would be pretty pleased with it. It is a really handy package and would make an amazing truck gun or ranch type rifle. I think the Texas in me is coming out.


I loaded another mag up and burnt though it pretty quick. You can see that RKM9 rail that the pistol shares with the rifle. Just like the Mutant rifle we tested we experienced no malfunctions and the pistol seemed to be pretty accurate. We had so much fun blowing through ammo we ran out before we had a chance to do a proper accuracy test but I have no doubt that it is just as accurate with a proper rest as the rifle was.


After¬†spending an afternoon with the new CMMG Mutant pistol I really can see myself thinking hard about buying one to SBR. I am not aware of any plans as of now to offer a factory SBR, but I am sure CMMG will. Both Alex and I enjoyed both versions of the Mutant we have been able to get a chance to run through it’s paces at the range. I honestly can’t say enough good about the gun, it offers all the benefits of the AR series of rifles with the added benefit of ultra cheap steel case 7.62×39.

CMMG has the pistol priced with a MSRP of $1499.95. Keep your eye out for more information on the CMMG website here.


Phil Note: I’d like to thank CMMG for allowing TFB the opportunity to bring TFB readers the first announcement/review of this new Mutant pistol. More to come:-)

Patrick R

Patrick is a Senior Writer for The Firearm Blog and TFBTV Host. He likes guns and has liked shooting guns for as long as he can remember. You can follow Patrick on Instagram @tfbpatrick, Facebook, or contact him by email at

The above post is my opinion and does not reflect the views of any company or organization.


  • iksnilol

    Is it possible to use the lower with other 7.62×39 uppers? I was thinking a side charging upper would be nice.

    Also, in regards to the barrel, how loud was it? I am thinking of a short barreled 7.62×39 in the future and can’t really decide on barrel length 10 inches seems nice in regards to ballistics and pressure. But I sorta want to use a suppressor that adds 5.5 inches in length. So a shorter 7.5 inch barrel would be more handy. But I don’t know if it would wear out the suppressor faster and how loud would it be in comparison to the longer barrel.

    • I don’t shoot 7.62×39 but I do shoot 300 Blackout suppressed and a 9 inch barrel. Even with supersonic ammo it’s quiet enough no hearing protection is needed. Without a suppressor it’s a bit loud but not punishing by any means.

      As far as switching uppers I’m not sure. If you email CMMG they can tell you.

      • iksnilol

        That was fast.

        9 inch barrel wouldn’t be a bad idea. Will have to look into that. I am thinking of a short AK in the future. Short, heavy, fluted barrel (probably a chopped down RPK barrel) with a pistol length gas system. Adjustable gas block is almost a must if you want to suppress an AK effectively (I am sure you know they are overgassed by default).

        I was thinking about compatibility with other uppers since from what I understand the LSHO doesn’t work with the AK mags. And using the AR charging handle every time sounds a bit inconvenient.

        Thanks for the help.

      • mig1nc

        Phil, question: They say one reason .300Blk is so great in a short suppressed package is that it burns all the propellant in ~9″ of barrel. Since x39 has greater case capacity, I would assume this isn’t true of the Soviet round. Is it? Have you ever compared x39 and .300Blk suppressed?

        • I wish I could help you with that one but I haven’t spent much time shooting a suppressed 7.62×39. The 300 does tend to burn all the powder that part is true. My guess on the 7.62 is it wouldn’t in that short a barrel.

        • Sianmink

          There’s a reason the Russians went to 9×39 for their suppressed long guns. 7.62×39 is super tricky to run subsonic.

          That said it doesn’t give up too much for shorter barrels, about 32fps per inch. A suppressed Draco shouldn’t be too loud. Just don’t expect subsonic quiet.

          • mig1nc

            Yeah, I’m mostly talking supersonic.

  • I knew this SBR was coming but I couldn’t say anything. CMMG posted it on their website.

    • iksnilol

      That looks awfully handy.

      • That it does

        • iksnilol

          I mean, you could have it under the seat or something and then just plain forget it. Would be a shame if you sold your jeep only for the new owner to find an SBR there that isn’t theirs.

          Awfully handy indeed.

  • Face vs Keyboard

    Steel cased 7.62×39 ammo isn’t any cheaper than steel cased 5.56 these days. Both float right around $.25 per round shipped. Personally I’d just stick with 5.56 unless you have some attraction to the larger caliber and slightly higher energy.

    Oh and I refuse to believe that there is any practical use for a gun with just a buffer tube on the back. Id much rather have one with no buffer tube, or even better, a stock.

    But hey, whatever floats your goat…

    • iksnilol

      Regarding AR pistols, having one without the buffer tube would provide the possibiliy of a folding stock (that can actually fire while folded).

      The PWS Diablo was interesting, if only it had a folding stock.

      • Face vs Keyboard

        Exactly. Folding stock is pretty much the best of both worlds. Short when you want it, Stock when you want it. You can fire either way (as long as it doesn’t require a buffer tube like an AR). To me the buffer tube just adds useless length.

        No matter how many rifles come out without a buffer tube, the AR lives on. It’s interesting. Is it the price point? The modularity? Familiarity?

        My bet is on price point. It’s always about the money.

        • The buffer tube adds a few advantages that aren’t obvious at first glance. For example, the AR has the ability to mount different buffer weights, which give more options when trying to adjust the system to improve reliability with different barrel lengths, ammunition types, etc. For another, the buffer tube lightens the receiver by reducing its dimensions in exchange for a lightweight tubular extension that also serves as a stock mount.

          Is it cheaper? I’d argue that other designs like the SIG MCX and ZM Weapons LR300 show it’s not really cheaper.

          I wouldn’t discount it, though. It might not facilitate a folding stock, but folders have proven to not be that useful, while the benefits of the AR’s receiver design continue to be very useful.

          • mig1nc

            Larry Vickers recently posted a review of the MCX and he commented how having a buffer tube gives some systems (not the MCX) more flexibility in timing. Also, I would personally point out that from an engineering standpoint, the buffer tube also keeps more of your recoiling mass inline with the bore for a more linear engine.

          • iksnilol

            You can use different buffer weights. It is certainly cheaper than switching out bolts. But you can also improve reliability with differenta ammo types if you use an adjustable gas system. So that advantage is mostly moot except if you want to reduce fire rate on full auto, IIRC one version of the XM231 fired at 200 RPM, that was possible due to some special buffer.

            Price, never mentioned that IIRC.

            Folding stocks wouldn’t be so widespread if they weren’t useful. Heck, just look at all the rifles that people remove the stocks from to make them more compact. That should be telling. Saying folding stocks aren’t useful is like saying that ARs are unreliable trash guns. Glaringly false.

          • BrandonAKsALot

            Thank you for saying exactly what I was thinking. A properly engineered adjustable gas system will alleviate that issue. The buffer tube does lengthen the impulse of the carrier cycle, so it should lessen the overall feel and rise caused by the cycle. I don’t personally like the idea of adding weight to a gas operated system unless absolutely necessary. It’s a band-aid of sorts.

        • iksnilol

          My money says familiarity and commonality. Same reason I stick with 7.62×39 and AKs. They are familiar and very common in my corner of the world.

          From a designer point of view, I dislike the buffer tube since it makes the gun longer than it has to be.

  • Budogunner

    $1,500 for a 7.62×39 pistol that still requires a buffer tube? Pass. I’d rather get a full size AK with folding stock and pocket the savings.

    • iksnilol

      I believe you could get an AK pistol and SBR it for less than 1500.

    • Panzercat

      This really makes me sad. I know we all want AR ergos, but a buffer tube on a 7.62 platform. Cripes, buy a pistol PAP– $450. Buy some rails. $150 if you get all spendy. SBR tax stamp– $200. I think I came in at $800 there. Wait! Throw in $50 more for a folding stock.

      I think you get the idea.

  • Evil_Bonsai

    I disagree on the cheek weld buffer tube. Granted, I shoot 300BLK this way, not 7.62×39, but I’ve read they’re mostly comparable. I DID have issues with cheek weld and my sites sitting on standard rail. I added a medium riser (what I had; could probably use a low riser) to get the tube off cheekbone and slightly lower into fleshy part of cheek, and it shoots great this way. I’d say add a short riser to the above and it’d probably a LOT more comfortable to shoot. My cheek bone was consistently sore after shooting before adding the riser. Now I have no issue at all.

  • Southpaw89

    Well, to only good reason I can think of to keep an AR pistol as a pistol is saving $200, and at $1500 you aren’t saving anything, I say SBR that baby!

  • jerry young

    why does everybody think they have to lay guns in the dirt to photograph them? that being said add a but stock and you’ll have your truck rifle, the cost is way to much an AK style pistol sells for $500 and up and you don’t have to deal with the buffer tube, great platform for a rifle but the AR doesn’t make a good pistol too much sticking out the rear past the grip